Feature #507: Implement/test "fail-open" option - Suricata - Open Information Security Foundation

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Feature #507

closed

Implement/test "fail-open" option

Added by Eric Leblond over 12 years ago. Updated about 12 years ago.

Status:

Closed

Priority:

Normal

Assignee:

Eric Leblond

Target version:

1.4beta1

Effort:

Difficulty:

Label:

Description

A new feature has recently been introduced in NFQUEUE. It is possible to accept packets when the queue is full. This could be useful in Suricata when admin wants to privilege network behavior over security.

More information and patch: http://www.digipedia.pl/usenet/thread/16261/26536/

Files

0001-nfq-implement-fail-open-support.patch (3.99 KB) 0001-nfq-implement-fail-open-support.patch

Eric Leblond, 08/08/2012 08:53 AM

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Updated by Victor Julien over 12 years ago

Status changed from New to Assigned
Assignee set to Eric Leblond
Target version set to 1.4beta1

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Updated by Eric Leblond over 12 years ago

The associated patch is in 3.6-rc1, I don't think this will be in an official kernel before the release of 1.4beta1.
No problem on my side to work on a git Linux but this will be more difficult for testers.

Maybe we could postpone this to a beta2 ?

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Updated by Victor Julien over 12 years ago

If the API is likely to remain the same I have no problem with already supporting it now.

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Updated by Eric Leblond over 12 years ago

OK, working on it ASAP.

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Updated by Eric Leblond over 12 years ago

File 0001-nfq-implement-fail-open-support.patch 0001-nfq-implement-fail-open-support.patch added

I've implemented this and tested it using latest Linux git and latest libnetfilter_queue git. And it works:

# scp on lo with MTU at 100
# With fail-open
root@test-squeeze:~# scp linux-image-3.*deb localhost:/tmp
linux-image-3.3.0-rc3noct+_3.3.0-rc3noct+-10.00.Custom_amd64.deb                                                                                                                 100%   31MB   3.5MB/s   00:09
linux-image-3.6.0-rc1-netfilter+_3.6.0-rc1-netfilter+-10.00.Custom_amd64.deb                                                                                                     100%   30MB   3.3MB/s   00:09
# Without fail-open
root@test-squeeze:~# scp linux-image-3.*deb localhost:/tmp
linux-image-3.3.0-rc3noct+_3.3.0-rc3noct+-10.00.Custom_amd64.deb                                                                                                                 100%   31MB 504.7KB/s   01:03    
linux-image-3.6.0-rc1-netfilter+_3.6.0-rc1-netfilter+-10.00.Custom_amd64.deb                                                                                                     100%   30MB 513.6KB/s   00:59

The attached patch is the implementation.

Please note, there is no possibility to detect that the feature is not available in kernel.

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